Logic Families and Their Characteristcs Questions and Answers

Take Exam

Logic Families and Their Characteristics questions with answers are an important part of digital electronics aptitude. Understanding TTL, CMOS, and ECL logic families is vital for solving problems in timing, voltage levels, and power consumption. Exams like GATE, DRDO, and ISRO frequently include such questions to test a student’s grasp of digital circuit behavior. This section provides well-structured aptitude questions with step-by-step solutions, helping students compare logic families and analyze their performance parameters. Strengthen your understanding of digital systems through these practice problems and prepare effectively for competitive exams.

Logic Families and Their Characteristcs

Showing 10 of 47 questions

31. The problem of interfacing IC logic families that have different supply voltages (VCC's) can be solved by using a:

  • level-shifter
  • tristate shifter
  • decoupling capacitor
  • pull-down resistor
Show Answer Report

32. What is the advantage of using low-power Schottky (LS) over standard TTL logic?

  • more power dissipation
  • less power dissipation
  • cost is less
  • cost is more
Show Answer Report

33. When is a level-shifter circuit needed in interfacing logic?

  • A level shifter is always needed.
  • A level shifter is never needed.
  • when the supply voltages are the same
  • when the supply voltages are different
Show Answer Report

34. A TTL totem-pole circuit is designed so that the output transistors:

  • are always on together
  • provide linear phase splitting
  • provide voltage regulation
  • are never on together
Show Answer Report

35. The most common TTL series ICs are:

  • E-MOSFET
  • 7400
  • quad
  • AC00
Show Answer Report

36. Which family of devices has the characteristic of preventing saturation during operation?

  • TTL
  • MOS
  • ECL
  • IIL
Show Answer Report

37. How many 74LSTTL logic gates can be driven from a 74TTL gate?

  • 10
  • 20
  • 200
  • 400
Show Answer Report

38. What is the difference between the 74HC00 series and the 74HCT00 series of CMOS logic?

  • The HCT series is faster.
  • The HCT series is slower.
  • The HCT series is input and output voltage compatible with TTL.
  • The HCT series is not input and output voltage compatible with TTL.
Show Answer Report

39. Why are the maximum value of VOL and the minimum value of VOH used to determine the noise margin rather than the typical values for these parameters?

  • These are worst-case conditions.
  • These are normal conditions.
  • These are best-case conditions.
  • It doesn't matter what values are used.
Show Answer Report

40. What is the standard TTL noise margin?

  • 5.0 V
  • 0.0 V
  • 0.8 V
  • 0.4 V
Show Answer Report
Digital Electronics
Questions and Answers for Competitive Exams Various Entrance Test